Anti-eavesdropping window structure

Details Anti-eavesdropping window structure Anti-eavesdropping window structure

1987-04-03

1989-05-16

Murtagh, John E.

Static structures (e.g., buildings)

Viewing port for specific environment

381 731, 381191, E04B 199, E06B 510

Patent

active

048297291

ABSTRACT:
An anti-eavesdropping window structure in which the inner and outer panes, separated by a spacer frame have thickness d and D such that D/d is at least equal to 1.5. The space between the panes is filled with a gas mixture having a density in excess of that of air and a body-sound generator applied directly to the outer pane generates thermal noise over a frequency range of 200 to 3000 Hz to superimpose a level of such noise of at least 20 dB on transmitted sound.

REFERENCES:
patent: 4019295 (1977-04-01), Derner et al.
patent: 4047351 (1977-09-01), Derner et al.
patent: 4052564 (1977-10-01), Propst
patent: 4173668 (1979-11-01), Hentzel
patent: 4319088 (1982-03-01), Orfield
patent: 4352039 (1982-09-01), Hagood
patent: 4610115 (1986-09-01), Thompson
patent: 4686693 (1987-08-01), Ritter
patent: 4687687 (1987-08-01), Terneu

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